Figure 1: Phylogenetic relationship based on pol gene (reverse transcriptase 1–268 codon) sequences. Sequences are from Punjab shown in (dark red color), Haryana (pink color), Chandigarh (Brick red color), and Himachal Pradesh (Green color). Drug resistance isolates highlighted in different symbols, i.e., ∆: L74V, ★: K219N, □: Y181C, : K219R. Global HIV-1 subtype C reference sequences (shown in blue & black color) and K obtained from Los Alamos HIV Sequence Database. Both Y181C isolates (IDU_CHD004 and IDU_CHD009) are IDUs; they are unique and not showing any clustering or interlinking.